How much weight can gain in a week by eating 3000 calories?

at least 15 pounds because that is too much calories. you should only have up to 1600 to 2500 calories a day.

This answer is partially incorrect. it is true that you should only intake between 1600 to 2500 calories a day, but considering that there is 3500 calories in 1 pound of fat, if you ate only 3000 calories you wouldn't even gain 1 whole pound let alone 15.